Intake device of internal combustion engine

Abstract

An intake device of an internal combustion engine, includes: a plurality of intake ports which have outer walls and partition walls and are adjacent to each other via the partition walls; a valve body which is provided in each of the intake ports, and switches a flow path of the intake port by rotation around a rotation shaft; a holding member which is installed on each of the outer walls and the partition walls; and a rolling bearing which is mounted on at least one of the holding members, and supports the valve body to be freely rotatable, wherein the holding member includes a wall surface between the rolling bearing and the valve body in a direction in which the rotation shaft extends.

What is claimed is: 
     
       1. An intake device of an internal combustion engine, comprising:
 a plurality of intake ports which have outer walls and partition walls and are adjacent to each other via the partition walls; 
 a valve body which is provided in each of the intake ports, and switches a flow path of the intake port by rotation around a rotation shaft; 
 a holding member which is installed on each of the outer walls and the partition walls; and 
 a rolling bearing which is mounted on at least one of the holding members, and supports the valve body to be freely rotatable, 
 wherein the holding member includes a wall surface between the rolling bearing and the valve body in a direction in which the rotation shaft extends, the wall surface of the holding member being positioned towards the valve body, relative to a surface of the rolling bearing facing the valve body, in the direction in which the rotation shaft extends. 
 
     
     
       2. The intake device of an internal combustion engine according to  claim 1 ,
 wherein the wall surface opposes and being close to at least a part of a sealing unit formed around the valve body. 
 
     
     
       3. The intake device of an internal combustion engine according to  claim 1 ,
 wherein the holding member installed on the partition wall includes a first member and a second member, and 
 wherein the rolling bearing is mounted between the first member and the second member in the direction in which the rotation shaft extends. 
 
     
     
       4. The intake device of an internal combustion engine according to  claim 2 ,
 wherein the holding member installed on the partition wall includes a first member and a second member, and 
 wherein the rolling bearing is mounted between the first member and the second member in the direction in which the rotation shaft extends. 
 
     
     
       5. The intake device of an internal combustion engine according to  claim 2 ,
 wherein the wall surface abuts against the sealing unit in a state where the valve body is closed when the sealing unit abuts against a sealing surface formed in the intake port. 
 
     
     
       6. The intake device of an internal combustion engine according to  claim 3 ,
 wherein the wall surface abuts against the sealing unit in a state where the valve body is closed when the sealing unit abuts against a sealing surface formed in the intake port. 
 
     
     
       7. The intake device of an internal combustion engine according to  claim 4 ,
 wherein the wall surface abuts against the sealing unit in a state where the valve body is closed when the sealing unit abuts against a sealing surface formed in the intake port. 
 
     
     
       8. The intake device of an internal combustion engine according to  claim 7 ,
 wherein the wall surface has a convex portion which protrudes toward the valve body, and the convex portion and the sealing unit abut against each other. 
 
     
     
       9. The intake device of an internal combustion engine according to  claim 1 , wherein a void is formed between the wall surface of the holding member and the rolling bearing in the direction in which the rotation shaft extends. 
     
     
       10. The intake device of an internal combustion engine according to  claim 9 , wherein the holding member includes a hollow portion at which the rolling bearing is mounted, and a communication hole is formed at the hollow portion relative to the rolling bearing to communicate between atmosphere and the void formed between the wall surface of the holding member and the rolling bearing in the direction in which the rotation shaft extends.